Remove usage of @Nonnull annotation

[optionsome]

Summary

We decided that @Nonnull annotation should not be used since it's the default behaviour when @Nullable is not used. This removes the the usage of the annotation.

Issue

This is related to #6095

Unit tests

Only automated updates.

Documentation

No updates, updates are done within the scope of #6095

Changelog

Skipped

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.85%. Comparing base (233674c) to head (fbe3a24).
Report is 3 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...entripplanner/ext/reportapi/model/CachedValue.java	0.00%	1 Missing ⚠️
...rg/opentripplanner/graph_builder/GraphBuilder.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6122      +/-   ##
=============================================
- Coverage      69.85%   69.85%   -0.01%     
+ Complexity     17497    17496       -1     
=============================================
  Files           1976     1976              
  Lines          74710    74710              
  Branches        7645     7645              
=============================================
- Hits           52191    52189       -2     
- Misses         19868    19870       +2     
  Partials        2651     2651              

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[leonardehrenfried]

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